When Spanish researcher Nacho Zamora first stumbled upon an image of “Solarsail,” an energy-generating art installation in Switzerland, he knew he had found something different from the other public artworks he had been studying — and something important.

Since that discovery, Zamora has been carefully cataloging solar-powered artworks around the world and interviewing their creators for his Solar Artworks Project, an online compendium of public art that is aesthetically striking, environmentally sustainable, and raises awareness about crucial renewable technologies.